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I did a search for this issue and could not find a problem similar to mine.

I have a 2008 X3 whose battery died and needed to be replaced. When the battery was replaced the terminals were put on the wrong ends and it blew some fuses. Took the car to the dealer and they took care of the issue, however, when I got the car back the rear liftgate would not open. The button on the door handle doesn't seem to do anything. I did notice that when I attempted to start the car with the wrong terminals in the rear wiper blade went off and was moving slowly.

I thought it was just a blown fuse that could be easily replaced but I can't find where the fuse for the liftgate is for the life of me.

I know it was a bone head move to put the cables on the wrong terminals... Hope it's not an expensive fix.